Experimental study on bio-clogging to pervious concrete by using pseudomonas aeruginosa
In practical application,various potential microbial actions would probably cause biological clogging to pervious concretes.In this study,bio-clogging experiment was performed to pervious concrete by using pseudomonas aeruginosa(P.a)as the model microorganism.Through the tests to growth process of microorganism,surface biofilm growth,porosity and permeability,the processes,characteristics and mechanism of bio-clogging in pervious concrete were analyzed and explored.The results showed that bio-clogging would occur in pervious concrete with biofilm formed from rapid growth and multiplication of bacteria,in which temperature and nutrient concentration were the main factors to dominate the processes of bio-clogging.Significant reduction of permeability would occur when the pore throats or water-conducting pores were blocked by bio-clogging.Difficult to break under a ponding head of the simulated rainfall,the biofilms coaled to pore walls might cause a permanent clogging to pervious concrete.The bio-clogging processes in pervious concrete could be summarized into initial stage,early stage and development stage.Due to beneficial macro-pore property,however,biological clogging and its influence on pore and permeability performance would be an ongoing long-term process.
pervious concretebiofilmbio-cloggingporosity testreduction of permeability
万方数据
维普
